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clutter: Add capture API for reading stage pixels

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clutter_stage_capture should be used instead of directly utilizing
cogl's read_pixels API's.

https://bugzilla.gnome.org/show_bug.cgi?id=768978
This commit is contained in:
Jonas Ådahl 2016-06-25 08:10:27 +08:00
parent cd0f8e5cd1
commit ff6186f1ec
2 changed files with 110 additions and 0 deletions
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97
clutter/clutter/clutter-stage.c
View File

@ -4661,3 +4661,100 @@ _clutter_stage_presented (ClutterStage *stage,
g_signal_emit (stage, stage_signals[PRESENTED], 0,
(int) frame_event, frame_info);
}
static void
capture_view (ClutterStage *stage,
gboolean paint,
ClutterStageView *view,
cairo_rectangle_int_t *rect,
ClutterCapture *capture)
{
CoglFramebuffer *framebuffer;
ClutterBackend *backend;
CoglContext *context;
cairo_surface_t *image;
uint8_t *data;
int stride;
CoglBitmap *bitmap;
framebuffer = clutter_stage_view_get_framebuffer (view);
if (paint)
{
_clutter_stage_maybe_setup_viewport (stage, view);
cogl_push_framebuffer (framebuffer);
clutter_stage_do_paint_view (stage, view, rect);
}
image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
rect->width, rect->height);
data = cairo_image_surface_get_data (image);
stride = cairo_image_surface_get_stride (image);
backend = clutter_get_default_backend ();
context = clutter_backend_get_cogl_context (backend);
bitmap = cogl_bitmap_new_for_data (context,
rect->width, rect->height,
CLUTTER_CAIRO_FORMAT_ARGB32,
stride,
data);
cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
rect->x, rect->y,
COGL_READ_PIXELS_COLOR_BUFFER,
bitmap);
if (paint)
cogl_pop_framebuffer ();
capture->rect = *rect;
capture->image = image;
cairo_surface_mark_dirty (capture->image);
cogl_object_unref (bitmap);
}
gboolean
clutter_stage_capture (ClutterStage *stage,
gboolean paint,
cairo_rectangle_int_t *rect,
ClutterCapture **out_captures,
int *out_n_captures)
{
ClutterStagePrivate *priv = stage->priv;
GList *views = _clutter_stage_window_get_views (priv->impl);
GList *l;
ClutterCapture *captures;
int n_captures;
captures = g_new0 (ClutterCapture, g_list_length (views));
n_captures = 0;
for (l = views; l; l = l->next)
{
ClutterStageView *view = l->data;
cairo_rectangle_int_t view_layout;
cairo_region_t *region;
cairo_rectangle_int_t view_capture_rect;
clutter_stage_view_get_layout (view, &view_layout);
region = cairo_region_create_rectangle (&view_layout);
cairo_region_intersect_rectangle (region, rect);
cairo_region_get_extents (region, &view_capture_rect);
cairo_region_destroy (region);
if (view_capture_rect.width == 0 || view_capture_rect.height == 0)
continue;
capture_view (stage, paint, view, &view_capture_rect,
&captures[n_captures]);
n_captures++;
}
*out_captures = captures;
*out_n_captures = n_captures;
return TRUE;
}

13
clutter/clutter/clutter-stage.h
View File

@ -145,6 +145,12 @@ struct _ClutterFrameInfo
float refresh_rate;
};
typedef struct _ClutterCapture
{
cairo_surface_t *image;
cairo_rectangle_int_t rect;
} ClutterCapture;
CLUTTER_AVAILABLE_IN_ALL
GType clutter_perspective_get_type (void) G_GNUC_CONST;
CLUTTER_DEPRECATED_IN_1_10
@ -252,6 +258,13 @@ CLUTTER_AVAILABLE_IN_1_14
void clutter_stage_skip_sync_delay (ClutterStage *stage);
#endif
CLUTTER_AVAILABLE_IN_MUTTER
gboolean clutter_stage_capture (ClutterStage *stage,
gboolean paint,
cairo_rectangle_int_t *rect,
ClutterCapture **captures,
int *n_captures);
G_END_DECLS
#endif /* __CLUTTER_STAGE_H__ */